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require 'fast_spec_helper'
describe Gitlab::Ci::Pipeline::Expression::Parser do
describe '#tree' do
context 'when using operators' do
it 'returns a reverse descent parse tree' do
expect(described_class.seed('$VAR1 == "123" == $VAR2').tree)
.to be_a Gitlab::Ci::Pipeline::Expression::Lexeme::Equals
end
end
context 'when using a single token' do
it 'returns a single token instance' do
expect(described_class.seed('$VAR').tree)
.to be_a Gitlab::Ci::Pipeline::Expression::Lexeme::Variable
end
end
context 'when expression is empty' do
it 'returns a null token' do
expect(described_class.seed('').tree)
.to be_a Gitlab::Ci::Pipeline::Expression::Lexeme::Null
end
end
end
end
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